/Engine/Source/Runtime/Landscape/Classes/LandscapeProxy.h
Exports landscape geometry into a raw mesh according to the export params
true if successful
bool ExportToRawMesh ( const [FRawMeshExportParams](API\Runtime\Landscape\ALandscapeProxy\FRawMeshExportParams) & InExportParams, [FMeshDescription](API\Runtime\MeshDescription\FMeshDescription) & OutRawMesh ) const